Technic, 1Kg 67139 Small-Sized Building Block Parts Package, 3X5 Wall-Hole Pin Connector Block, Liftarm with Cutout (About 330 pcs) ( Not Gobricks )

3x5 Wall-Hole Pin Connector Block
Appearance: A brick measuring 3x5 LEGO units in size, with standard Technic pin holes on its sides (the "walls"). The top may have standard studs or a smooth surface.

Core Function: Facilitates cross-system connections and angled constructions between System and Technic.

Adapter Interface: It can convert a "horizontal" Technic pin connection into a "vertical" standard brick stack, or vice versa. This is key for combining Technic frames with traditional brick-built shells.

Creating Angles: By inserting Technic pins into different positions on its side holes, another liftarm or beam can be easily attached at non-90-degree angles, useful for building triangular supports, slanted structures, or complex geometries.

Reinforcing Walls: When used as part of a wall, the side holes allow beams or brackets to be inserted from the inside, significantly enhancing the wall's strength and stability to prevent collapse.

Typical Application Scenarios
Dynamic Mechanical Structures: Used to create door-opening mechanisms, liftable crane arms, adjustable seats, active suspension systems, etc. Connector blocks are used to mount servo motors or change the direction of force transmission, while liftarms act as links and levers.

High-Stability Frameworks: Used to build the internal load-bearing skeletons for robots, RC cars, and complex sculptures. Their strength far surpasses that of simple brick stacking, and they are significantly lighter.

Complex Geometric Shapes: The non-standard angles created by connector blocks and the flexible connections of liftarms enable the construction of streamlined car bodies, slanted roofs, and organic sculptural forms that are difficult to achieve with traditional bricks.

Functional Integration Platforms: The cutouts in liftarms are ideal pathways for routing wires for light kits, sensors, or pneumatic tubes, keeping models tidy both inside and out.